The video moves even when there is no movement of the smartphone.

[HANNAH000]

I used sdk-simplevideowidget on v1.180.0 instead of v1.190.0 because my smartphone is not for Daydream. I developed 360videoPlayer using VrVideoView in sdk-simplevideowidget. And while I was playing the video for a long time, I found that the front of the video moved little by little. I fixed the smartphone in the front and then let the videoes play repeatedly without touching. As a result, the video was rotated yaw without any movement of the smartphone. I measured it and it moves about 12 degrees in about 1 minute. I tested on other models but the results were similar. When I installed and tested the 360 ​​video player downloaded from the Google Store on my smartphone, the video did not rotate. So I think it's a software problem, not a hardware problem. I also tested the original sdk-simplevideowidget and sdk-simplepanowidget, not the code I modified. I have found that both applications do yaw rotation very little by little. Please let me know if you know how to resolve this issue.